Analysis on Energy Consumption and Energy-Saving Retrofit of University Buildings in Hot Summer and Cold Winter Zone of China

Air-conditioning and lighting load in university building energy consumption account for 60% of the total energy consumption. In order to effectively reduce the energy consumption of lighting and air-conditioning, this paper selects a university building in Chengdu as the research object to analyze the energy saving potential of university lighting and air-conditioning load from active and passive measures based on the energy simulation software of EnergyPlus and life cycle theory. The results show that under the premise of meeting the indoor illumination demand, the replacement of the current lamps into more energy-saving lamps can save 27.40% of the total lighting load. Under the actual situation, adding an intelligent control system can save 26.71% of total lighting load, 5.03% of air-conditioning energy consumption, and 14.29% of total energy consumption. Secondly, adding insulation material to the external wall can save 40–60% compared with no insulation material, but different insulation properties have different effects on air-conditioning energy consumption. Considering the energy consumption and cost, 80 mm Rockwool has the best energy-saving effect, and the current condition can save 8.8% of air-conditioning load.